John Madden Football (1988 video game) - Wikipedia
John Madden Football - Video Game 1988 IBM PC XT at for sale online
Graphical Evolution of Madden NFL (1988-2020)
How John Madden Became the Face of a Video Game Empire - The New York Times
John Madden Football (1990) - MobyGames
Gamer God: How Madden became the biggest name in football
Madden's Game - 30 for 30 Podcasts
Madden NFL 19: The weird story behind the first 'John Madden Football' game
Video Game History Timeline - The Strong National Museum of Play
John Madden Football gameplay (PC Game, 1988)
The covers of the Madden video game